Hey dude. I have the exact same problem as you. It happened on both my windows 7 laptop and my windows xp computer which i just got a new graphics card for. I was gonna respond to you if i found out how to fix the problem at the end of year 3 with the 2 witch statues but i got nothin for now. Try going into the properties in lego hp years 1-4 and go to local files and click on verify integrity of game cache. That button basically downloads any missed and important files for the game. I just checked mine about an hour ago and i had like around 150 missing files. Unfortunately it didn't make a difference on my pc. But it might on yours. Give it a try. Just remember that your not the only one with this problem. I'm really really irritated cuz i wanna go on to year 4.